Reno/Stead Airport (ICAO: KRTS, FAA LID: RTS, formerly 4SD) is a large public and military general aviation airport located in the North Valleys area, 10 nautical miles (19 km) northwest of the central business district of Reno, in Washoe County, Nevada, United States. A former military installation until 1966, when it was known as Stead Air Force Base, the airport's sole remaining military presence consists of an Army Aviation Support Facility and the 189th General Support Aviation Battalion of the Nevada Army National Guard, flying CH-47 Chinook helicopters. The airport is owned by the Reno Tahoe Airport Authority.